CERT-FR Warns of Synology DSM Vulnerabilities
Multiple vulnerabilities in Synology DSM allow remote code execution, denial of service, and data confidentiality breaches; patches available.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 8 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CERT-FR has issued an advisory (CERTFR-2026-AVI-1209) detailing multiple vulnerabilities discovered in Synology's DiskStation Manager (DSM) operating system, which powers Synology NAS devices. The flaws affect DSM versions 7.2.1 (prior to 7.2.1-69057-12), 7.2.2 (prior to 7.2.2-72806-9), 7.3 (prior to 7.3.2-86009-4), and 7.4.x (prior to 7.4-90075). Eight CVEs are referenced: CVE-2026-13623, CVE-2026-13635, CVE-2026-13639, CVE-2026-13666, CVE-2026-13673, CVE-2026-13683, CVE-2026-13684, and CVE-2026-6205.
The vulnerabilities collectively enable a range of impacts including remote arbitrary code execution, remote denial of service, data confidentiality breaches, data integrity compromise, security policy bypass, indirect remote code injection (XSS), and SQL injection. No specific exploitation-in-the-wild has been reported by CERT-FR; the advisory is a standard vulnerability disclosure sourced from Synology's own security bulletin (Synology_SA_26_13, published 18 September 2026).
Defenders operating Synology NAS devices should prioritize patching to the fixed DSM versions referenced above. Given the exposure of NAS devices to remote networks and the potential for remote code execution, organizations should verify DSM version compliance and apply Synology's official patches promptly, particularly for internet-facing storage systems.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1209
Free public brief. Slack alerts on the vendors you run come with the paid plans, and a new account gets three days of them, no card.
What this brief leaves out
This page is the free tier: the write-up, the severity, the names. In the app the same report carries live profiles of the CVEs it names. The paid plans add the security research and news reporting the free tier leaves out.
It sits in a corpus of 16,445 reports from 149 sources, 666 of them written in the last seven days, and it grows through the day.
A new account starts with three days of all of it, no card, then keeps the government and CERT reporting free. Slack alerts are a paid-plan feature: name the vendors you run and Slack hears about the reports that touch them, not the rest of the week's. Nothing is charged unless you subscribe.
Create a free account What it costs